PREPARATION OF 1-CHLORO-2-TRIFLUOROMETHYL-3,3,3- TRIFLUOROPROPENE FROM ISOBUTANE

摘要

PREPARATION OF 1-CHLORO-2-TRIFLUOROMETHYL- 3,3,3-TRIFLUOROPROPENE FROM ISOBUTANE Isobutane is catalytically converted to l-chloro-2-trifluoromethyl-3,3,3-trifluoropropene ¢(CF31)C = CHC1! in a dehydro/chlorofluorination reaction zone by passing a mixture of anhydrous hydrogen fluoride, chlorine and the isobutane over a chromium oxide or metal fluoride dehydro/chlorofluorination catalyst. Alternatively, the isobutane feed is first prechlorinated, and the mixture of prechlorination fed for conversion to the desired (CF3)2C = CHC1, to a downstream fluorination reactor charged with the dehyro/chlorofluorination catalyst. The l-chloro-2-trifluoromethyl-3,3,3-trifluoropropene product is of value as an intermediate in the preparation of hexafluoroisobutylene.